Abstract
In this paper, we propose a feasible scheme for purifying two-qubit entanglement in the presence of decoherence by employing weak measurements. As long as the entanglement parameter \(\alpha \) and the measurement strength \(p\) satisfy a certain condition, we can always achieve the purification without reference to the initial state. Furthermore, an arbitrary initial state can be directly purified into the maximally entangled state by setting measurement strength \(p=1-\frac{\left| \alpha \right| }{\sqrt{1-\left| \alpha \right| ^{2}}}\). The success probability of our scheme not only depends on measurement strength, but also closely links to the initial state.
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This work was supported by the National Science Foundation of China under Grant Nos. 11074002 and 61275119, by the Doctoral Foundation of the Ministry of Education of China under Grant No. 20103401110003 and also by the Personal Development Foundation of Anhui Province (2008Z018).
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Shi, JD., Xu, S., Ma, WC. et al. Purifying two-qubit entanglement in nonidentical decoherence by employing weak measurements. Quantum Inf Process 14, 1387–1397 (2015). https://doi.org/10.1007/s11128-015-0918-z
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DOI: https://doi.org/10.1007/s11128-015-0918-z